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Fri, 18 Sep 2026 08:17:42 +0000 X-Mizu-Trace-ID: d0581680cb0ed85c X-Migadu-Flow: FLOW_OUT Date: Fri, 18 Sep 2026 16:17:32 +0800 From: Baoquan He To: Wandun Chen Cc: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, robh@kernel.org, saravanak@kernel.org, akpm@linux-foundation.org, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, m.szyprowski@samsung.com, mark.rutland@arm.com, kernel@xen0n.name, alex@ghiti.fr, hpa@zytor.com, ruirui.yang@linux.dev, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, iommu@lists.linux.dev Subject: Re: [PATCH v6 00/10] kdump: reduce vmcore size and capture time Message-ID: References: <20260902073116.802752-1-chenwandun1@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260902073116.802752-1-chenwandun1@gmail.com> X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 22CBE180005 X-Stat-Signature: x1kawmp4odfwan4tkudtynsjsm1hxzcy X-HE-Tag: 1789719463-375605 X-HE-Meta: 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 Z4JD9Agq UIMuajvEhjz2K6kmGiIhkbkTo/wMbVFw29fITwiTQKC+iJDOMW8F9B41NT42sz4jpUupXSe8ygIpH4sWtPXAE8QQP+8jSt+m4wYwzVvESlUTUWylGZRY5x7Cxl6DUmbm+SWwue+V/YgRVGfPwIo/k5jjra3nevt+Mr7BNTizkZekTaoYsJI1BcraXfPNIaj2gEnZOY80wQYvPi6MmJVMeENa0i4u/oOKMElCsaknWXhhX79AggrYx9s4G3WT0hr73/nq+xnlaqu5jPCicbjFyunmpA0HT3wkbKl53AMJxQVhkjqzLQqyzgWlMc4xqJ9pzbXGSy2HaqYddH2s= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 09/02/26 at 03:31pm, Wandun Chen wrote: > From: Wandun Chen > ...snip... > ACPI systems already filter reserved memory out of the vmcore through > their existing path; only DT-based systems currently fail to filter these > regions, which is what this series addresses. The flag lives in memblock > itself rather than in a DT-only structure, so the mechanism is generic and ~~~ The patchset itself looks goot to me, while I am concerned if it's really generic. I raised that in sub-thread talking with Wandun. Imagine I tried to exclude many driver regions and split memblock regions into hundreds, cma could yell out: cma_declare_contiguous_multi()? IMHO, withdrawing the claim can fix the nit concern. If I am wrong, please help point it out to let me learn more. Thanks Baoquan > both ACPI and DT systems can benefit from it (suggested by Rob, thanks) [1]. > > Since the reserved memory regions are filtered out, the vmcore is > smaller in size and faster to produce. > ...snip...